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Use of proprietary or undefined elements and attributes instead of those defined in W3C recommendations. For example the use of the Blink element or the Marquee element which were non-standard elements originally only supported by Netscape and Internet Explorer browsers respectively.
Media queries is a feature of CSS 3 allowing content rendering to adapt to different conditions such as screen resolution (e.g. mobile and desktop screen size). It became a W3C recommended standard in June 2012, [ 1 ] and is a cornerstone technology of responsive web design (RWD).
Undefined parameter values are tricky: if the first positional parameter was not defined in the template call, then {{{1}}} will evaluate to the literal string "{{{1}}}" (i.e., the 7-character string containing three sets of curly braces around the number 1), which is a true value.
HTML is a markup language that web browsers use to interpret and compose text, images, and other material into visible or audible web pages. Default characteristics for every item of HTML markup are defined in the browser, and these characteristics can be altered or enhanced by the web page designer's additional use of CSS.
An optional media type. The media type part may include one or more parameters, in the format attribute=value , separated by semicolons ( ; ) . A common media type parameter is charset , specifying the character set of the media type, where the value is from the IANA list of character set names. [ 6 ]
A component is undefined if it has an associated delimiter and the delimiter does not appear in the URI; the scheme and path components are always defined. [13]: §5.2.1 A component is empty if it has no characters; the scheme component is always non-empty. [13]: §3 The authority component consists of subcomponents:
A list-defined reference has a conflicting group attribute "$1" (see the help page). A list-defined reference named "$1" is not used in the content (see the help page). A list-defined reference has no name (see the help page). The named reference "$1" was defined multiple times with different content (see the help page).
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